Aerial system



Oct. 22, 1935. N. WELLS 2,018,337

AERIAL SYSTEM Filed May 7, 1932 (TV L X s L 4/? 5 F Wr WR u; M

mAMsM/me R7 R1? Mei/m? 7' R INVE MA ATTORNEY ship to one another Patented Oct. 22, 1935 UNETED STATE PATENT Norman Wells, London,

Radio Corporation of AERIAL SYSTEM of Delaware Applicat England, assignor to America, a corporation ion May '7, 1932, Serial No. 609,783

In Great Britain May 15, 1931 4 Claims.

more particularly to required. for use for transmitting systems in which aerials and for receiving purposes are mounted in such close relationference by pick up upon the receiving aerial of energy fr that there is risk of interleads associated with om leads associated with the transmitting aerial.

Though not limited to its application thereto,

the present invention is well adapted for use on shipboard or at other stations ere limited area in cases in cted on sites of which short wave omnidirectional aerials or aerials (such, for example,

as horizontal dipoles) associated are suspended either horizontally fairly close relationship,

quired for duplex operation. (It is,

with reflectors or otherwise in such aerials being reof course, quite common to associate dipole and other aerials with reflectors to minimize be appreciated that the transmitting and receiving the great majority of cases, such relationship terference by pick the receiver aerial diated by the leads transmitting aerial.

The present invention has this difiiculty and utilizes the interference in wireless receiving be prevented by shielding wires allel to and close to wire or other device According to this ling station comprises mitting and one close to one another, feeding a transmitter to ing wires leading receiver, and one or more grou transmission in or reception from other than desired directions.)

It will owing to restrictions of space aerials will, in

have to be erected in that there is serious risk of inup upon the down leads from to the receiver, oi. energy rafrom the transmitter to the for its object to avoid known fact that apparatus may supported paran aerial lead wire or feed to be protected.

invention, a wireless signaltwo aerials one for transfor receiving arranged fairly wires leading from the transmitting aerial, feedfrom the receiving aerial to a nded screening wires running parallel to and spaced from the leads to the transmitting aerial and/or the leads from the receiving aerial.

The grounded screening wire 0 grounded through an impedance e. g. damping resistances.

Preferably, screening wires are with the leads from the receiving leads to the transmitting aerial.

In certain cases it may be a screening r wires may be or impedances,

associated both aerial and the desirable to employ wire or wires associated with the receiver leads only in the manner described.

distance between a screenn lead may be In some cases the ing wire and the associated dow conveniently one-quarter of the working wave length.

The invention is illustrated in the accompanying drawing which shows schematically one way of carrying out the invention as applied to a. shipa. board installation.

Referring to the drawing, the installation therein shown comprises two aerials AT, AR, one AT for transmitting and the other AR for receiving, these aerials being each constituted by a horizontal dipole and being suspended in the same straight line by suitable insulation and suspension means I and S between a pair of masts M, the inner and adjacent ends 01' the two aerials being, 0'! course, insulated from one another by ES; suitable suspension and insulation means I and S which are in the same straight line with the two aerials.

A pair of parallel down leads LT connect the transmitter T to the transmitting dipole as in the usual way and a similar pair of parallel down leads LR connect the receiving dipole to the receiver R. Parallel to and spaced from the down leads LT is a screening wire WT which is parallel to the said down leads and is carried atits 25 upper end by suitable insulators I and suspension wires S from the general horizontal suspension. The lower end of the screening wire is earthed through a suitable resistance or impedance RT. A second screening wire WR and re- 30 sistance RR is associated with the receiving aerial down leads in a similar manner.

The transmitter T and receiver R are situated as far apart as conveniently possible so that in the preferred arrangement the down leads from 35 the transmitting aerial and from the receiving aerial diverge from one another as they come downwards, as shown, the screening wires being similarly divergent since they are parallel to the down leads with which they are associated.

The invention is particularly intended to neutralize the radiation from aerial feeder wires, which radiation is unavoidable in practice owing to the difficulty of matching the surge impedance of the feeder at its junction with the aerial.

I claim:

1. A wireless signaling system comprising a transmitting dipole and a receiving dipole arranged horizontally in the same straight line and insulated from one another, a pair of down leads from the transmitting dipole to an associated transmitter, a second pair of down leads from the receiving dipole to an associated receiver, a screening wire running parallel to and adjacent the down leads from the transmitting dipole, and

a further screening wire running parallel to and the receiving dipole to an associated receiver, 9. adjacent the down leads from the receiving die screening'wire running parallel to and'adjacent pole, said down leads and associated screening the down leads from the transmitting dipole, wires diverging from one another in a downwards and a further screening wire running parallel to direction. and adjacent said down leads from the receiving 5 2; A wireless signalling system comprising a dipole, said screening wires being intermediate transmitting dipole and a receiving dipole arsaid transmitting and receiving down leads, said ranged horizontally in the same straight line and pair of down leads from the transmitting dipole insulated from'one another, a pair of down leads and its associated screening wire diverging from from the transmitting dipole to an associated said other pair of down leads and its screening 10 transmitter, a second'pair of down leads from wire in a downward direction. the receiving dipole to an associated receiver, 4. A wireless signalling system comprising a a screening wire running parallel to and adjatransmitting dipole and a receiving dipole arcent the down leads from the transmitting dipole,- ranged horizontally in a straight line and insuand a further screening wire running parallel to lated from one another, a pair 01' down leadsfrom 15 and adjacent said down leads from the receiving the transmitting dipole to an associatedrtransdipole, said'screening wires being intermediate 'mitter, a second pair of down leads from the said transmitting and'receiving down leads. receiving dipole to an associated receivenscreen- 3. A wireless signalling system comprising a ing wires having damping resistances therein transmitting dipole and a receiving dipole arrunning parallel to and adjacent the down leads ranged horizontally in the same straight line and from the transmitting and receiving dipoles, said insulated from one another, a pair of down leads screening wires being located intermediate said from the transmitting dipole to an associated transmitting and receiving down leads. transmitter, a second pair of down leads from r NORMAN WELLS. 

